lcd ssd1289 fsmc stm32f4discovery fuzzy

[fastlink30]

use chibistudio - stm32f4 discovery chibi/os & ugfx from repository

driver use fsmc

i show video of what happen, is more simple to explain:

http://youtu.be/Hy4FAoNO5EM

sometimes when the board start the display remain white (only backlite), after some reset i see the logo of ugfx (perfect),

after the logo everytime the first lines are ok (seems) but after some time the display start show fuzzy things, like in the video

can be a problem of signal speed of fsmc? too quick for the lcd? is possible slow down the signal speed?

seems like loose the syncronism

thanks

[Joel Bodenmann]

First of all we can be sure that this is no wiring issue as the display actually displays what it is supposed to (µGFX logo).

How long are your wires? Everything longer than 20cm will cause problems with the default board file.

As you said yourself you have to lower the FSMC speed. Look at the reference manual to learn about the different settngs. There are timings for address setup, data and burst operations. The timings are set in the init_board() routine of your board file (line 89 in your case).

~ Tectu

[fastlink30]

i have changed to:

FSMC_Bank1->BTCR[FSMC_BANK+1] = (6) | (15 << 8) | (15 << 16);

and now is ok

[Joel Bodenmann]

Glad to hear that everything is working for your now.

~ Tectu